获取cpu、内存、磁盘io、网络流量等相关数据

我要检测服务器上的性能：现在要做个java的程序 希望 有代码！ 和讲解 谢谢

private double getCpuRatioForWindows() {
    try {
        String procCmd = System.getenv("windir")
                + "\\system32\\wbem\\wmic.exe process get Caption,"
                + "KernelModeTime,ReadOperationCount,UserModeTime,WriteOperationCount";
        // 取进程信息
        long[] c0 = readCpu(Runtime.getRuntime().exec(procCmd));
        Thread.sleep(CPUTIME);
        long[] c1 = readCpu(Runtime.getRuntime().exec(procCmd));
        if (c0 != null && c1 != null) {
            long idletime = c1[0] - c0[0];
            long busytime = c1[1] - c0[1];
            return Double.valueOf(
                    PERCENT * (busytime) / (busytime + idletime))
                    .doubleValue();
        } else {
            return 0.0;
        }
    } catch (Exception ex) {
        ex.printStackTrace();
        return 0.0;
    }
}

private long[] readCpu(final Process proc) {
    long[] retn = new long[2];
    try {
        proc.getOutputStream().close();
        InputStreamReader ir = new InputStreamReader(proc.getInputStream(), "gb2312");
        LineNumberReader input = new LineNumberReader(ir);
        String line = input.readLine();
        if (line == null || line.length() < FAULTLENGTH) {
            return null;
        }
        int capidx = line.indexOf("Caption");
        int kmtidx = line.indexOf("KernelModeTime");
        int rocidx = line.indexOf("ReadOperationCount");
        int umtidx = line.indexOf("UserModeTime");
        int wocidx = line.indexOf("WriteOperationCount");
        long idletime = 0;
        long kneltime = 0;
        long usertime = 0;
        while ((line = input.readLine()) != null) {
            if (line.length() < wocidx) {
                continue;
            }
            // 字段出现顺序：Caption,KernelModeTime,ReadOperationCount,
            // UserModeTime,WriteOperation
            String caption = substring(line, capidx, kmtidx - 1)
                    .trim();
            // log.info("line="+line);
            if (caption.equals("System Idle Process")
                    || caption.equals("System")) {
                idletime += Long.valueOf(
                        substring(line, kmtidx, rocidx - 1).trim())
                        .longValue();
                idletime += Long.valueOf(
                        substring(line, umtidx, wocidx - 1).trim())
                        .longValue();
                continue;
            } else if (caption.equals("wmic.exe"))
                continue;
            kneltime += Long.valueOf(
                    substring(line, kmtidx, rocidx - 1).trim())
                    .longValue();
            usertime += Long.valueOf(
                    substring(line, umtidx, wocidx - 1).trim())
                    .longValue();
        }
        retn[0] = idletime;
        retn[1] = kneltime + usertime;
        return retn;
    } catch (Exception ex) {
        ex.printStackTrace();
    } finally {
        try {
            proc.getInputStream().close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return null;
}

取cpu使用率

在控制台执行下
String procCmd = System.getenv("windir")

• "\system32\wbem\wmic.exe process get Caption,"
• "KernelModeTime,ReadOperationCount,UserModeTime,WriteOperationCount"; 这个指令，一看就明白

[code="java"]
public MonitorInfoModel getMonitorInfoModel() throws Exception {
// 构造返回对象
MonitorInfoModel infoModel = new MonitorInfoModel();
// 可使用内存
infoModel.setTotalJVMMemorySize(Runtime.getRuntime().totalMemory() / M);
// 剩余内存
infoModel.setFreeJVMMemorySize(Runtime.getRuntime().freeMemory() / M);
infoModel.setUsedJVMMemorySize(infoModel.getTotalJVMMemorySize() -
infoModel.getFreeJVMMemorySize());
OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory
.getOperatingSystemMXBean();
// 操作系统
String osName = System.getProperty("os.name");
infoModel.setOsName(osName);
// 总的物理内存
infoModel.setTotalPhysicalMemorySize(osmxb.getTotalPhysicalMemorySize()
/ M);
// 剩余的物理内存
infoModel.setFreePhysicalMemorySize(osmxb.getFreePhysicalMemorySize()
/ M);
// 已使用的物理内存
infoModel.setUsedPhysicalMemorySize(infoModel.getTotalPhysicalMemorySize()
- infoModel.getFreePhysicalMemorySize());
infoModel.setTotalSwapMemorySize(osmxb.getTotalSwapSpaceSize() / M);
infoModel.setFreeSwapMemorySize(osmxb.getFreeSwapSpaceSize() / M);
infoModel.setUsedSwapMemorySize(infoModel.getTotalSwapMemorySize()
- infoModel.getFreeSwapMemorySize());
double cpuRatio = 0;
if (osName.toLowerCase().startsWith("windows")) {
cpuRatio = getCpuRatioForWindows();
} else {
cpuRatio = getCpuRateForLinux();
}
if (cpuRatio > 99.99)
cpuRatio = 100.0;
infoModel.setCPURatio(cpuRatio);
return infoModel;
}

public class MonitorInfoModel implements Serializable {

private static final long serialVersionUID = 1L;
/** JVM可使用内存 */
private long totalJVMMemorySize;
/** JVM剩余内存 */
private long freeJVMMemorySize;
/** JVM使用内存 */
private long usedJVMMemorySize;
/** 操作系统 */
private String osName;
/** 总的物理内存 */
private long totalPhysicalMemorySize;
/** 剩余的物理内存 */
private long freePhysicalMemorySize;
/** 已使用的物理内存 */
private long usedPhysicalMemorySize;
/** 总的缓存 */
private long totalSwapMemorySize;
/** 剩余的缓存 */
private long freeSwapMemorySize;
/** 已使用的缓存 */
private long usedSwapMemorySize;
/** cpu使用率 */
private double cpuRatio;

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